Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Which of the following does NOT dissolve in water?
Oil dissolved in water
Oil dissolved in water
A heterogeneous mixture is a mixture in which the components do not mix uniformly and remain distinct, having separate phases. Oil dissolved (or rather, suspended/immiscible) in water forms two distinct layers, making it a classic example of a heterogeneous mixture.
A heterogeneous mixture is a mixture in which the components do not mix uniformly and remain distinct, having separate phases. Oil dissolved (or rather, suspended/immiscible) in water forms two distinct layers, making it a classic example of a heterogeneous mixture.
Think of floating drops of ghee or mustard oil in a bowl of dal or soup тАФ you can clearly see the distinct oil layer and the water-based soup beneath it.
HEtERO = Different parts (you can see the DEFERent parts/layers).
Homo┬аge┬аneousтЖТUniform┬аcomposition┬аthroughout
\text{Hetero ge neous} \rightarrow \text{\text{Non} -uniform composition with visible boundaries}
Oil and water are immiscible because oil molecules are non-polar hydrocarbons while water molecules are polar. Due to hydrogen bonding in water, water molecules strongly attract each other and exclude the non-polar oil molecules. Consequently, they do not form a uniform solution; instead, the oil forms droplets or a separate upper layer depending on density.
A homogeneous mixture has a uniform composition throughout (e.g., salt solution, sugar solution, copper sulphate solution).
A heterogeneous mixture has physically distinct parts and non-uniform composition (e.g., oil and water, chalk powder in water, sand and water).
Oil and water are immiscible liquids that separate into layers based on density.
Solutions are always homogeneous, whereas suspensions and emulsions are usually heterogeneous.
Components in heterogeneous mixtures can often be easily separated by physical methods like decantation, filtration, or using a separating funnel.
Composition is not uniform, so samples taken from different parts of the mixture will have different properties.
Separation of oil and water using a separating funnel in chemical laboratories.
Emulsions in food industry (like milk and butter processing).
| Feature | Homogeneous | Heterogeneous |
|---|---|---|
Composition | Uniform throughout | Non-uniform, distinct phases |
Visibility of components | Not visible separately | Visible separately |
Sugar dissolved in water forms a true solution (homogeneous).
Salt dissolved in water forms a true solution (homogeneous).
Copper sulphate powder dissolved in water forms a clear blue true solution (homogeneous).
D is correct тАФ Oil dissolved in water does not form a true solution; instead, oil remains immiscible and forms a separate layer, making it a heterogeneous mixture.
Always remember: Aqueous solutions of salts, sugars, and soluble ionic compounds (like CuSO4) are always homogeneous. Immiscible liquids (like oil and water) and undissolved solids in liquids are heterogeneous.
Get instant step-by-step AI explanations, full shift Previous Year Papers (SSC GD, RRB, SSC JE), and regional rank analysis on the official Examoogle App.
Free Download тАв 100K+ Aspirants